<TITLE>toupper</TITLE>
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<h3>TOUPPER(3)          Linux Programmer's Manual          TOUPPER(3)
</h3>

<h3>NAME
</h3>       toupper, tolower - convert letter to upper or lower case

<h3>SYNOPSIS
</h3>       #include &lt;ctype.h&gt;

       int toupper (int c);
       int tolower (int c);

<h3>DESCRIPTION
</h3>       toupper()  converts  the letter c to upper case, if possi-
       ble.

       tolower() converts the letter c to lower case,  if  possi-
       ble.

<h3>RETURN VALUE
</h3>       The  value  returned is that of the converted letter, or c
       if the conversion was not possible.

<h3>CONFORMS TO
</h3>       ANSI - C, BSD 4.3

<h3>BUGS
</h3>       The details of what constitutes an uppercase or  lowercase
       letter  depend  on  the  current locale.  For example, the
       default "C" locale does not know about umlauts, so no con-
       version is done for them.

       In some non - English locales, there are lowercase letters
       with no corresponding  uppercase  equivalent;  the  German
       sharp s is one example.

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<h3>SEE ALSO
</h3><p>
<a href=../EXAMPLES/is_examp.c>isalpha</a>, 
<a href=setlocale.htm>setlocale</a>, 
<a href=locale.htm>locale</a>, 
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<h3>GNU                       April 4, 1993                         1
</h3>

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